//Return true if the string in the first element of the array contains all of the letters of the string in the second element of the array.
function mutation( arr ) {
  let arr0 = arr[ 0 ].toLowerCase().split( "" )
  let arr1 = arr[ 1 ].toLowerCase().split( "" )
  if ( arr1.every( v => arr0.includes( v ) ) ) {
    return true
  } else {
    return false
  }
}
console.log( mutation( [ "Hello", " He" ] ) )
console.log( mutation( [ "ALien", "LINE" ] ) )
